Gold fell over 1% on Tuesday and was set for a fourth straight monthly decline, as uncertainty in the Middle East gave way to expectations of US interest rate hikes to tame inflation. Spot gold declined 1.5% to $3,957.74 per ounce by 0112 GMT and was set for a monthly fall of 12.7%. US gold futures for August delivery lost 1.7% to $3,971.60. The US dollar was headed for a monthly gain,